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Electricians/Welder Guys

ForumsAdminStagingForumsAdminStaging Administrator Posts: 88 admin
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What would be an event that would cause all six rectifier diodes to go open all at once? Sticking the rod for a period of time? Or? My neighbor has a Miller Big D4 welder. A couple weeks ago his neighbor kid wanted to use it. They had trouble with it not wanting to strike an arc at that time. The kid messed with it and got it welding, and used it. Fast forward two weeks, and the kid wanted to use it again. Trouble again with no arc. The kid doesn't remember what he did to get it to weld. The guy that owns it checked it out, and couldn't find anything obvious. I checked it over today, and it appears that all of the rectifier diodes are open. We removed three, and checked them, and they are open both directions. Haven't pulled the other three, but at this point we are assuming they are gunnybag too. Any ideas? TIA for any input.

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